THERE ARE BASIC PARAMETERS THAT NEED TO BE MAINTAINED FOR TROPICAL FISH. PH, AMONIA, NITRITES AND NITRATES NEED TO BE TESTED CONSISTENTLY. A QUALITY FILTRATION SYSTEM WILL HELP CONTROL TOXIC LEVELS BY CULTIVATING A NITROGEN CYCLE. REGULAR WATER CHANGES ARE NECESSARY TO REDUCE STRESS AND ADD TRACE ELEMENTS AND ELECTROLITES TO THE SYSTEM. A GOOD TAP WATER CONDITIONER WILL REMOVE CHOLRINE AND OTHER TOXINS. MARINE SYSTEMS NEED A SYNTHETIC SALT MIXTURE TO ATTAIN A LEVEL OF 1.018-1.024. THERE ARE TEST KITS AVAILABLE TO KEEP YOUR WATER PARAMETERS IN CKECK.